Question

Answer the following questions

1. What is radiation? Give absorption and reflection of radiant heat by a body
2. What is convection?
3. What is conduction?
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Solve the numerical
1. The normal body temperature in Celcius scale is 37°C. Calculate in Kelvin scale and Fahrenheit scale.
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Answer 1

Answer:

1 Ans:- Radiation refers to the transfer of heat from a hot body to cold body directly, without heating the medium between two bodies. The radiant heat is of the form of electromagnetic waves.

2 Ans:- Convection is the circular motion that happens when warmer air or liquid — which has faster moving molecules, making it less dense — rises, while the cooler air or liquid drops down. Convection is a major factor in weather. ... That current can result in wind, clouds, or other weather.

3 Ans:- Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules. ... Conduction occurs more readily in solids and liquids, where the particles are closer together than in gases, where particles are further apart.

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Numerical:

Solution We know that K = C + 273

Thus, the normal body temperature in Kelvin scale = 37 +273 = 310 K

We also know that,

C/5 = F-32/9

37/5 = F-32/9

37 × 9 = 5F - 160

333 = 5F - 160

333 + 160 = 5F

493 = 5F (Dividing 493/5 comes 98.6)

F = 98.6

Thus, the normal body temperature in Fahrenheit scale is 98.6°F

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Answer 2

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( 1 ) Radiation is the process of transfer of heat in the form of electromagnetic waves, from a body at higher temperature to a body at lower temperature without the necessity of the intervening medium. For example, when we stand near an open fire we feel warm.

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( 2 ) Convection is the process of transfer of heat from part of body at higher temperature to a body at lower temperature with actual movement of particles. For example, on receiving heat, the molecules at the base of the container becomes light in weight, and moved upward. Now, the new colder molecules come to the bottom of container in this process heat gets transferred continuously throughout the water, by moving molecules.

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( 3 ) Conduction is the process of transfer of heat from part of body at higher temperature to a body at lower temperature without actual movement of particles. For example, a metal rod AB one end of it is placed on a flame. After some time, the other end of the rod gets heated. Heat transfers from A towards B. Here heat tansfer takes place through molecules. On receiving heat, molecules at end A starts vibrating and collide with its neighboring molecule and transfer heat.

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( 1 ) Here, we're asked to convert the normal body temperature in celsius to Kelvin and Fahrenheit.

» The relation between degree Kelvin, Celsius and Fahrenheit is given by:

$\qquad\qquad\star~{\underline{\boxed{\pmb{\frak{C=\dfrac{F-32}{1.8}=K-273}}}}}$

where:

• C is Celsius (C=F-32/1.8)
• K is Kelvin (K=C+273)
• F is Fahrenheit (F={1.8×C}+32)

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Now, let's firstly convert the Celsius to Kelvin:

$\\:\implies\quad\sf{K=C+273}\\\\\\:\implies\quad\sf{K={37}^{\circ}C+273}\\\\\\:\implies\quad\red{\pmb{\sf{K={310}^{\circ}K}}}$

Now, let's convert Celsius to Fahrenheit:

$\\\dashrightarrow\quad\sf{F=(37\times 1.8)+32}\\\\\\\dashrightarrow\quad\sf{F=66.6+32}\\\\\\\dashrightarrow\quad\purple{\pmb{\sf{F={98.6}^{\circ}F}}}$

❝Hence, 37°C in Kelvin and Fahrenheit is 310°K and 98.6°F respectively. ❞